# MIME Type Lookup

> Find the correct MIME type for any file extension, and vice versa.

To find a MIME type, enter a file extension such as .webp or a type such as image/webp. Sending the correct Content-Type header matters because browsers with nosniff enabled will refuse to execute or render a mislabelled file.

**URL:** https://convertto.tech/t/mime-type-lookup
**Category:** Developer Tools (https://convertto.tech/c/developer-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Enter or paste your extension or mime type.
2. The result appears immediately — copy or download it.

## FAQ

### Why does the MIME type matter if the extension is right?

Because the browser trusts the Content-Type header over the extension. Serving JavaScript as text/plain means it will not execute, and serving an upload as text/html means it will — which is how file uploads become cross-site scripting.

### What is application/octet-stream?

The generic "unknown binary" type. Browsers download rather than display it, which makes it a safe default for arbitrary files but wrong for anything you want rendered inline.

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